President Barack Obama pops in for a low-key meal at Hanoi’s famous Bun Cha Huong Lien restaurant with chef and TV host Anthony Bourdain, who picked up the $6 bill for dinner. Crowds gather outside to get a glimpse of the US president. Surrounded by bodyguards, he stops to greet excited locals, many capturing the moment on their phones, before being whisked away in his limousine